I have heard stories about peopl putting a stick in your tank to check for red dyed fuel.So last night I was out by the truck and had a small stick and decided to see if someone could put a stick down inside to the fuel level.It can't be done on my truck. However I did go get a flexable piece of plastic line and it will go down to the fuel, but there is not enough on the line to tell.So that would tell me if they do poke your tank they have to use a tube and collect a sample of fuel.No Stick! Truth in doing.